Use the coefficients to predict the amount of reactant consumed or product formed The ratio of the coefficients is a ratio of the moles taking part in a reaction Reactants on the left of the arrow are consumed ID: 791287
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Slide1
(Mole-Mole problems)
Slide2(Mole-Mole problems)
Use the coefficients to predict the amount of reactant consumed or product formed
The ratio of the coefficients is a ratio of the moles taking part in a reaction.Reactants (on the left of the arrow) are consumedProducts (on the right of the arrow) are formedGiven the number of moles of any substance in a reaction, you can use the coefficients to find the number of moles of any other substance.
J Deutsch 2003
2
Slide3Place the moles given over the coefficient for that substance and set up a proportion with the coefficients.
How many moles of oxygen are produced when 4 moles of KClO3 react according to the equation:
2 KClO3 2 KCl + 3 O2 4
X 2 KClO3 2 KCl + 3 O24 = X 2 3 cross multiply to get 2X = 12X=6 moles
J Deutsch
203
3
given
unknown
Slide4Slide5J Deutsch 2003
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Regents Question: 06/03 #20
Given the reaction:
PbCl
2
(
aq
) + Na
2CrO4 (aq) PbCrO4 (s) + 2NaCl(aq)What is the total number of moles of
NaCl formed when 2 moles of Na2CrO4 react completely?(1) 1 mole(2) 2 moles (3) 3 moles(4) 4 molesþ
Slide6J Deutsch 2003
6
Regents Question: 06/03 #20
Given the reaction:
PbCl
2
(
aq
) + Na
2CrO4 (aq) PbCrO4 (s) + 2NaCl(aq)What is the total number of moles of
NaCl formed when 2 moles of Na2CrO4 react completely?(1) 1 mole(2) 2 moles (3) 3 moles(4) 4 molesþ
Slide7J Deutsch 2003
7
Regents Question: 06/02 #34
A compound has a gram formula mass of 56 grams per mole. What is the molecular formula for this compound?
CH
2
C
2
H
4C3H6C4H8
þ
Slide8J Deutsch 2003
8
Regents Question: 01/03 #42
Given the equation:
2C
2
H
2
(g) + 5O
2(g) 4 CO2(g) + 2H2O(g)How many moles of oxygen are required to react completely with 1.0 mole of C2H2?2.52.05.010
þ